free fire zone

no-fire zone / no fire zone

accident-free flying / mishap-free flying

mishap-free flying / accident-free flying

nuclear-free zone

weapons free zone (WFZ)

obstacle free zone (OFZ)

grid zone / grid-zone

zone standard time (zone time) (ZST)

killing zone / kill zone

grid zone designation / Grid Zone Designator

grey-zone / grey zone (international relations)

hundred-per-cent zone (one-hundred-per-cent zone)

flight restriction zone / flight restricted zone (FRZ)

slant fire; diagonal fire; oblique fire; fire to the oblique

free-fire area

zone of effective fire

call for fire zone (CFFZ)

rolling / creeping barrage (fire zone)

zone system of fire

zone of fire

zone fire

fire control orders (FCO) ('Hold Fire', 'Cease Fire' and 'Engage')

selector lever, fire selector, fire switch, fire selector switch

contact-free war

contamination-free

fallout-free

free fall

free fall air drop

free mine

free naval control of shipping

free net

free neutron